Turnable means for camera take-up spools



Sept. 3, 1-940. J. GALTER TURNABLE MEANS FOR CAMERA TAKE-UP SPOOLS Filed April 17, 1940 i i I Jnz/enlbz k cz r i f Patented Sept. 3, 1940 UNITED STATES TURNABLE MEANS FOR CAMERA TAKE-UP SPOOLS Jack Galter, Chicago, Ill. Application April 1'7, 1940, Serial No. 339430 3 Claims.

My invention relates to improvements in the turnable means for the take-up spools of cameras.

For some time the shanks of turning members attached to the take-up spools of cameras have required the drilling of a hole therein for the attachment of a spring thereto. It is among the objects of my invention to eliminate the drilling of such a hole and to provide a shank of such a construction and a spring so formed that the spring may be readily attached to the shank. Such attachment of the spring to the shank may be made by machinery, such as an arbor press, and thus eliminate the hand threading of the spring through the hole to the shank required by the old construction. My construction also prevents accidental withdrawal of the shank from the camera. Another object of my invention is to supply means for preventing the take-up spool from being unwound by a coiled spring on the shank operable with the walls of the casing itself and without the need of separate clutch inserts. My invention also contemplates such other objects, advantages and capabilities as will later more fully appear and which are inherently possessed by my invention.

While I have shown in the accompanying drawing a preferred embodiment of my invention, yet I wish it understood that the same is susceptible of modification and change without departing from the spirit of my invention.

Referring tothe drawing, Fig. 1 is an elevational view of the interior of a camera from the rear showing my turnable take-up means in opcrating position; Fig. 2 is a detail sectional View of the same on line 22 of Fig. 1; Fig. 3 is a detail sectional view on line 33 of Fig. 2; Fig. 4 is a front elevation of my driving spring; Fig. 5 is an elevation of preferred form of my brake spring; Fig. 6 is a detail sectional view of another form of my shank construction; Fig. 7 is a detail sectional view on line 1-1 of Fig. 6; Fig. 8 is a detail elevation of my knob construction.

The embodiment selected to illustrate my invention comprises a camera in which there is a take-up chamber 10 for housing the take-up spool H on which the exposed film is rolled. In order to turn the take-up spool H from the exterior of the camera I provide a knob 12 having a shank 13 which extends through an opening 14 in the casing l I into the take-up chamber 10.

The shaft 15 of the take-up spool 1| extends beyond the film guides 16 and on one end 17 has a groove 18 cut thereacross.

The shank 13 has a peripheral groove 19 adjacent its inner end 80. Said inner end has a central hollowed out portion 8! extending within the shank l3 and a more shallow transverse slot 82. t 1

A spring 83 is formed with an end portion 84 ii extending into a rounded portion 85. A loop portion 86 connects rounded portion with a complementary opposite rounded portion8l. Beyond 7 said rounded portion 81' the spring bends upwardly and back on itself at 88 to form a substantially straight end portion 39. The rounded portions 85 and 87 are arcs forming portions of a circle having substantially the same inside diameter as that portion of the shank 13 over which the spring fits.

In use the spring 33 is fitted on shank 13, with the rounded portions 85 and 81 fitting within peripheral groove 19 and the straight end portion 89 fitting within slot 82.

The end H of take-up spool H is fitted into the 20 hollow portion 8! in the end 89 of shank 13, with the groove 18 of the spool H receiving the end portion 89 of spring 83.

A slightly different embodiment as shown in Fig. 6 omits the peripheral groove 79 and provides 25 raised portions 90 above and below the positioned rounded portions 85 and 81 so as to prevent accidental displacement of the spring 83.

In use when the knob 12 is turned, its shank 13 of course turns with the knob and carries 30 spring 83 with it. The end portion 89 of the spring 83 contacting the end portion 11 of the take-up spool at the same time turns the take-up spool H and rolls the film thereon.

The spring 83 also functions to prevent the accidental withdrawal of the shank 13 from the casing H, and eliminates the need of a separate Washer.

Another spring 9! is coiled around the inner portion of the shank 13. The spring 9! at its outer end has a straight portion 92 on a radius from the center of the spring. When the shank 13 is inserted into opening 74 in casing ll, por tion 92 of spring 9! enters slot 93 provided therefor in casing ll adjoining opening Hi. When the 4.5 knob 72 is turned in the direction for winding film on the take-up spool H, which is also arranged so that it is the unwinding direction. for spring 9!, the wall of casing II to one side of the slot 93 acts as a clutch and grips portion 92. This 50 permits the spring 9| to turn on shank 13. When the knob 12 is turned in the opposite direction, which is also the direction for winding the spring 9|, portion 92 is held by the wall on the other side of said slot 93 and spring 9| tightens on shank 13 55 so that it cannot be turned. This construction prevents undesired unrolling of exposed film on take-up spool H.

A different embodiment shown in Fig. 8 discloses coiled spring 9| with portion 92 plus another portion 96 bent from portion 92 and extending parallel to the axis of the shank I3. When shank I3 is inserted into opening 14 in casing Il, portion 96 enters opening 91 in casing ll provided therefor. This construction functions the same in use as the other embodiment previously described.

Both of these constructions eliminate the need of a separate insert, may be more easily assembled and result in substantial economies.

While I have described portion 92 as on a radius from the center of spring 9| and portion 93 as extending parallel to the axis of the shank 13, yet I do not wish to be limited to this exact construction as these portions 92 and 93 may extend on any desired angle from the spring 9| to fit within a suitable opening or slot placed therefor-in the casing H.

Having thus described my invention, ,1 claim:

1. In a camera, a casing having a take-up spool chamber, a film take-up spool housed in said chamber, said take-up spool having a pair of spaced film guides and a shaft extending between and beyond said guides, said shaft having a transverse groove in one of its ends; aturnable member having a knob positioned atthe exterior of said casing, said turnable member having attached to said knob a shank extending through said casing into said take-up chamber, the inner end of said shank being hollow and also having a transverse slot, a spring having a pair of opposite rounded portions and a straight upper portion, said spring mounted on said shank with the rounded portions bearing against the body of the shank andthe straight portion lying within the transverse slot, said shaft. contacting said shank with .the grooved end of said shaft positioned Within the hollow end of said shank and the groove of said shaft straddling the straight upper portion of the spring.

2. In combination with a turnable member for the take-up spool of a camera, said turnable member having a shank with a slot in its inner end, a spring for ready and direct attachment to said shank, said spring formed of a single piece and having a. pair of opposite rounded portions forming arcs of a circle with substantially the same diameter as that of the shank, said spring bent upwardly and-back upon itself to form a straight end portion, the rounded portions of said spring bearing against the rounded body of said shank and the straight end portion of said spring ex- A tending through the slot in the end of the shank. 3. In combination with a turnable memberfor the take-up spool of a camera, said turnable meme ber having a shank with a peripheral groove and a slot in its inner end, a spring for ready and direct attachment to said shank, said spring formed of a single piece and having a pair of op-, posite rounded portions forming arcs of a circle with substantially the same diameter as that of the shank, said spring bent upwardly and back upon itself to form a straight end portion, the rounded portions of said spring positioned within said peripheral groove of said shank and the straight end portion of said spring extending through the slot in the end of the shank.

JACK GALTER. 

